PROBLEM TO BE SOLVED: To provide a heat flux measuring system, a solar concentration simulator system therefor, and a heat flux measuring method for measuring heat fluxes in solar concentration apparatuses or solar concentration simulator systems.SOLUTION: A measuring system for measuring heat fluxes of concentrated light at least comprises a heat flux sensor 28 formed of a thermocouple; a heat flux unit 22 equipped with two measuring lines including a ground cable 29 and a strand 30; an adjuster 21 for adjusting the measuring position of the heat flux unit 22 on the basis of the optical axis of the concentrated light; and a shutter 34 of an intercepting unit that intercepts light incidence on the heat flux unit 22. Further, a heat flux measuring system 19 has an incidence unit 23 on which sunlight comes incident and is collected, and the incidence unit 23 is provided with a light concentrator lens 33 for collecting sunlight and a lens holder 32 for holding the light concentrator lens 33.
